Mirror of the official OpenWrt uci repository
https://git.openwrt.org/project/uci
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323 lines
8.9 KiB
323 lines
8.9 KiB
/*
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* ucimap.h - Library for the Unified Configuration Interface
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* Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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/*
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* This file contains ucimap, an API for mapping UCI to C data structures
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*/
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#ifndef __UCIMAP_H
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#define __UCIMAP_H
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#include <stdbool.h>
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#include "uci.h"
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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#define BITFIELD_SIZE(_fields) (((_fields) / 8) + 1)
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#define CLR_BIT(_name, _bit) do { \
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_name[(_bit) / 8] &= ~(1 << ((_bit) % 8)); \
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} while (0)
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#define SET_BIT(_name, _bit) do { \
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_name[(_bit) / 8] |= (1 << ((_bit) % 8)); \
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} while (0)
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#define TEST_BIT(_name, _bit) \
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(_name[(_bit) / 8] & (1 << ((_bit) % 8)))
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#ifndef __GNUC__
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#define __optmap_gen_type(_type, _field) -1
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#ifndef likely
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#define likely(_expr) !!(_expr)
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#endif
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#ifndef unlikely
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#define unlikely(_expr) !!(_expr)
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#endif
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#else /* __GNUC__ */
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#define __compatible(_type, _field, _newtype) \
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__builtin_types_compatible_p(typeof(&(((_type *)0)->_field)), _newtype *)
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#define __list_compatible(_type, _field, __val, __else) \
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__builtin_choose_expr(__compatible(_type, _field, struct ucimap_list *), __val, __else)
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#define __int_compatible(_type, _field, __val, __else) \
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__builtin_choose_expr(__compatible(_type, _field, int), __val, \
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__builtin_choose_expr(__compatible(_type, _field, unsigned int), __val, \
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__else))
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#define __string_compatible(_type, _field, __val, __else) \
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__builtin_choose_expr(__compatible(_type, _field, char *), __val, \
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__builtin_choose_expr(__compatible(_type, _field, unsigned char *), __val, \
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__builtin_choose_expr(__compatible(_type, _field, const char *), __val, \
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__builtin_choose_expr(__compatible(_type, _field, const unsigned char *), __val, \
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__else))))
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#define __bool_compatible(_type, _field, __val, __else) \
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__builtin_choose_expr(__compatible(_type, _field, bool), __val, __else)
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#define __optmap_gen_type(_type, _field) \
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__list_compatible(_type, _field, UCIMAP_LIST, \
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__int_compatible(_type, _field, UCIMAP_INT, \
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__string_compatible(_type, _field, UCIMAP_STRING, \
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__bool_compatible(_type, _field, UCIMAP_BOOL, \
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-1))))
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#ifndef likely
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#define likely(x) __builtin_expect(!!(x), 1)
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#endif
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#ifndef unlikely
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#endif
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#endif /* __GNUC__ */
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#define UCIMAP_OPTION(_type, _field) \
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.name = #_field, \
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.offset = offsetof(_type, _field), \
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.detected_type = __optmap_gen_type(_type, _field), \
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.type_name = #_type
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#define UCIMAP_SECTION(_name, _field) \
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.alloc_len = sizeof(_name), \
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.smap_offset = offsetof(_name, _field), \
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.type_name = #_name
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struct uci_sectionmap;
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struct uci_optmap;
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struct ucimap_list;
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struct ucimap_fixup;
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struct ucimap_alloc;
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struct ucimap_alloc_custom;
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struct ucimap_section_data;
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struct uci_map {
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struct uci_sectionmap **sections;
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unsigned int n_sections;
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bool parsed;
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void *priv;
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/* private */
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struct ucimap_fixup *fixup;
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struct ucimap_fixup **fixup_tail;
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struct ucimap_section_data *sdata;
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struct ucimap_section_data *pending;
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struct ucimap_section_data **sdata_tail;
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};
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enum ucimap_type {
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/* types */
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UCIMAP_SIMPLE = 0x00,
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UCIMAP_LIST = 0x10,
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UCIMAP_TYPE = 0xf0, /* type mask */
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/* subtypes */
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UCIMAP_CUSTOM = 0x0,
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UCIMAP_STRING = 0x1,
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UCIMAP_BOOL = 0x2,
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UCIMAP_INT = 0x3,
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UCIMAP_SECTION = 0x4,
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UCIMAP_SUBTYPE = 0xf, /* subtype mask */
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/* automatically create lists from
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* options with space-separated items */
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UCIMAP_LIST_AUTO = 0x0100,
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UCIMAP_FLAGS = 0xff00, /* flags mask */
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};
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union ucimap_data {
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int i;
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bool b;
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char *s;
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void *ptr;
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void **data;
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struct ucimap_list *list;
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};
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struct ucimap_section_data {
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struct uci_map *map;
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struct uci_sectionmap *sm;
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const char *section_name;
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/* map for changed fields */
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unsigned char *cmap;
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bool done;
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/* internal */
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struct ucimap_section_data *next, **ref;
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struct ucimap_alloc *allocmap;
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struct ucimap_alloc_custom *alloc_custom;
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unsigned int allocmap_len;
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unsigned int alloc_custom_len;
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};
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struct uci_sectionmap {
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/* type string for the uci section */
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const char *type;
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/* length of the struct to map into, filled in by macro */
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unsigned int alloc_len;
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/* sectionmap offset, filled in by macro */
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unsigned int smap_offset;
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/* return a pointer to the section map data (allocate if necessary) */
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struct ucimap_section_data *(*alloc)(struct uci_map *map,
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struct uci_sectionmap *sm, struct uci_section *s);
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/* give the caller time to initialize the preallocated struct */
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int (*init)(struct uci_map *map, void *section, struct uci_section *s);
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/* pass the fully processed struct to the callback after the section end */
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int (*add)(struct uci_map *map, void *section);
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/* let the callback clean up its own stuff in the section */
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int (*free)(struct uci_map *map, void *section);
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/* list of option mappings for this section */
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struct uci_optmap *options;
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unsigned int n_options;
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unsigned int options_size;
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/* internal */
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const char *type_name;
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};
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struct uci_optmap {
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unsigned int offset;
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const char *name;
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enum ucimap_type type;
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int (*parse)(void *section, struct uci_optmap *om, union ucimap_data *data, const char *string);
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int (*format)(void *section, struct uci_optmap *om, union ucimap_data *data, char **string);
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void (*free)(void *section, struct uci_optmap *om, void *ptr);
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union {
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struct {
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int base;
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int min;
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int max;
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} i;
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struct {
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int maxlen;
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} s;
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struct uci_sectionmap *sm;
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} data;
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/* internal */
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int detected_type;
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const char *type_name;
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};
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struct ucimap_list {
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int n_items;
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int size;
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union ucimap_data item[];
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};
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/**
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* ucimap_init: initialize the ucimap data structure
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* @map: ucimap data structure
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*
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* you must call this function before doing any other ucimap operation
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* on the data structure
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*/
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extern int ucimap_init(struct uci_map *map);
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/**
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* ucimap_cleanup: clean up all allocated data from ucimap
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* @map: ucimap data structure
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*/
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extern void ucimap_cleanup(struct uci_map *map);
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/**
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* ucimap_parse: parse all sections in an uci package using ucimap
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* @map: ucimap data structure
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* @pkg: uci package
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*/
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extern void ucimap_parse(struct uci_map *map, struct uci_package *pkg);
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/**
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* ucimap_set_changed: mark a field in a custom data structure as changed
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* @sd: pointer to the ucimap section data
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* @field: pointer to the field inside the custom data structure
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*
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* @sd must be set to the section data inside the data structure that contains @field
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*/
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extern void ucimap_set_changed(struct ucimap_section_data *sd, void *field);
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/**
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* ucimap_store_section: copy all changed data from the converted data structure to uci
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* @map: ucimap data structure
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* @p: uci package to store the changes in
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* @sd: pointer to the ucimap section data
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*
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* changes are not saved or committed automatically
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*/
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extern int ucimap_store_section(struct uci_map *map, struct uci_package *p, struct ucimap_section_data *sd);
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/**
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* ucimap_parse_section: parse a single section
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* @map: ucimap data structure
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* @sm: uci section map
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* @sd: pointer to the ucimap section data
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* @s: pointer to the uci section
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*
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* this function overwrites the ucimap section data, do not use on a section
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* that has been parsed already
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*/
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extern int ucimap_parse_section(struct uci_map *map, struct uci_sectionmap *sm, struct ucimap_section_data *sd, struct uci_section *s);
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/**
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* ucimap_free_section: free a data structure for a converted section
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* @map: ucimap data structure
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* @sd: pointer to the ucimap section data
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*
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* this function will clean up all data that was allocated by ucimap for this section.
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* all references to the data structure become invalid
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*/
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extern void ucimap_free_section(struct uci_map *map, struct ucimap_section_data *sd);
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/**
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* ucimap_resize_list: allocate or resize a uci list
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* @sd: pointer to the ucimap section data
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* @list: pointer to the list field
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* @items: new size
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*
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* @sd must point to the data structure that contains @list.
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* @list must point to the field containing a pointer to the list, not the list directly
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* the memory allocated for this list is tracked for the section and freed automatically
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*/
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extern int ucimap_resize_list(struct ucimap_section_data *sd, struct ucimap_list **list, int items);
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/**
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* ucimap_free_item: free the allocated memory for a data structure member
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* @sd: pointer to the ucimap section data
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* @item: pointer to the field inside the data structure
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*
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* @sd must point to the data structure that contains @item.
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* @item must point to the field containing a pointer to the allocated item
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*/
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extern void ucimap_free_item(struct ucimap_section_data *sd, void *item);
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#endif
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